doi:10.16186/j.cnki.1673-9787.2023020073

Received:2023-02-27

Revised:2023-04-10

Online Date: 2023-09-27

Seismic performance analysis of centrally braced steel frame with one -side boltconnection（Online）

LIN Xinyan1,2,3,4, YANG Xinyu1,2,3,4, WANG Xinwu2, XUN Haisu2, LIU Huanhuan2,3, Jang Il Young4

1.College of Civil Engineering，Henan Polytechnic University，Jiaozuo  454000，Henan，China；2.Henan International Joint Laboratory of New Civil Engineering Structure，Luoyang Institute of Science and Technology，Luoyang  471023，Henan，China；3.School of Science，Wuhan University of Science and Technology，Wuhan  430070，China；4.College of Civil Engineering，Kumoh NationalInstitute of Technology，Gumi-si， 39177

Abstract:In order to study the seismic performance of the brace-semi-rigid steel frame structure system, a centerally braced steel frame with semi-rigid beam-column joints composed of nested one-side bolts and T-stub was designed, and the quasi-static test. Combined with the failure mode of the specimen, its hysteretic performance, bearing capacity, energy dissipation and other seismic indicators are analyzed. The results show that: The failure mode of the specimen is mainly buckling failure of the brace under compression, which shows the characteristics of ductile failure as a whole. The plastic deformation is mainly accumulated on the brace system, and the beam-column and T-stub joints have no obvious plastic deformation,After the brace is broken, the semi-steel frame still has higher bearing capacity, indicating that the structure have two seismic fortification lines. The cooperative work of brace and semi-rigid frame makes the specimen have higher lateral stiffness, resistance to horizontal deformation, higher bearing capacity, stable hysteretic performance and excellent energy dissipation capacity. The mechanical performance of the one-side bolts during the test is not significantly different from that of ordinary high-strength bolts. There is no serious preload relaxation phenomenon, and the bolt preload can be maintained efficiently.

Key words:center brace;one-side bolts;T-stub;semi-rigid connection;seismic performance

CLC: TU391;TU352.11